I am likely io9's worst science writer [Note: I am definitely io9's worst science writer] but I hope you don't begrudge me posting this fantastic scientific examination of Ireland's greatest export and contribution to civilization, Guinness. The super-hearty dry stout has an appearance, taste and texture unique among beers - and all beverages, really - so I think it's cool to hear about the physics and chemistry that make it such. If nothing else, bookmark this video so the next time you have a weekend-long Guinness bender, you can tell people it's "research."